1. Brake Light Switch: This is the most common culprit. The switch is located near the brake pedal itself. It's a small, usually cylindrical device that activates when you press the brake pedal.
* Inspection: Start by visually inspecting the brake light switch. Look for any obvious damage, cracks, or loose connections.
* Testing: You can test the switch with a multimeter (set to continuity). With the brake pedal *released*, there should be no continuity. When you press the pedal, continuity should be present. If it's always showing continuity, the switch is faulty and needs replacement. If there's no continuity even when the pedal is pressed, there might be a wiring problem.
* Replacement: Replacing the brake light switch is relatively straightforward, but the access varies depending on the year of your Windstar. Consult your owner's manual or a repair manual for your specific model year. Generally, you'll need to access it from under the dashboard. You'll likely need to disconnect the electrical connector and possibly unbolt the switch itself. Remember to be careful not to damage any surrounding components.
2. Wiring Issues: A short circuit or damaged wiring can also cause the brake lights to stay on.
* Inspection: Check the wiring harness leading from the brake light switch to the rear brake lights. Look for any frayed wires, melted insulation, or areas where the wires might be rubbing against metal.
* Testing: Use a multimeter to test the continuity and voltage of the wires. A short circuit will show low resistance even when the brake pedal is released. This requires more technical knowledge and the use of a wiring diagram.
3. Brake Pedal Position Sensor (Some Models): Depending on your Windstar's year and features, there might be a brake pedal position sensor involved in the system. A faulty sensor could send incorrect signals, keeping the brake lights on.
4. Fuse: While less likely to cause the lights to *always* be on, a blown fuse can cause unexpected electrical issues. Check the fuse box (often under the hood or inside the passenger compartment) and verify the fuse for the brake lights is intact. Replace it if necessary, but be aware that a blown fuse might indicate a larger problem that should be addressed.
Important Considerations:
* Safety First: Disconnecting your car's battery is always a good precaution before working on any electrical system to prevent accidental short circuits or shocks.
* Repair Manual: A repair manual specific to your Ford Windstar's year and model will provide detailed diagrams and instructions for accessing and replacing the brake light switch and other components.
* Professional Help: If you're not comfortable working on car electrical systems, it's always best to seek help from a qualified mechanic. Driving with constantly illuminated brake lights is unsafe and can lead to accidents.
By systematically checking these areas, you should be able to pinpoint the cause of your Windstar's persistent brake lights and get them fixed. Remember to replace parts with OEM (Original Equipment Manufacturer) parts whenever possible to ensure proper fit and function.
